Description / Abstract:

This Standard applies to information technology and
telecommunications equipment.

This Standard specifies:

— the method of determining the declared noise emission values
of a batch of machines,

— acoustical and product information to be given in technical
documents supplied to users by the manufacturer,

— the method for verifying the declared noise emission values
given by the manufacturers.

The uniform methods in this Standard use the noise emission data
obtained in accordance with ANSI/ASA S12.10/Part 1, and the
statistical methods and procedures specified in ISO 4871 and the
ISO 7574 series.

The declared A-weighted sound power level, LWad,
permits comparison of noise emissions between different products
and permits prediction of installation or work-place noise
immission levels.

Although the most useful quantity for calculating immission
levels due to one or more sound sources is usually the declared
A-weighted sound power level of the individual source(s), the
declared A-weighted emission sound pressure level, LpAm,
may be used to estimate the immission level in the immediate
vicinity of an isolated piece of equipment.

To avoid confusion between sound power levels and emission sound
pressure levels, the A-weighted sound power level is declared in
bels and the A-weighted emission sound pressure level is declared
in decibels.